llvm-svn: 71035

llvm-svn: 71033

llvm-svn: 71032

llvm-svn: 71028

allow it to have multiple CFG edges to that block. This is needed
to allow MachineBasicBlock::isOnlyReachableByFallthrough to work
correctly. This fixes PR4126.

llvm-svn: 71018

Running /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvm.src/test/
CodeGen/X86/dg.exp ...
FAIL: /Volumes/Sandbox/Buildbot/llvm/full-llvm/build/llvm.src/test/
CodeGen/X86/change-compare-stride-1.ll
Failed with exit(1) at line 2
while running: grep {cmpq       $-478,} change-compare-stride-1.ll.tmp
child process exited abnormally

llvm-svn: 71013

llvm-svn: 71010

Handle overflow of 64-bit loop conditions.

llvm-svn: 71008

addrspace(257) -> FS relative on x86.  Patch by Zoltan Varga!

llvm-svn: 70992

Revert part of 70929 that has to do with determining whether a SIB byte is needed. It causes a lot of x86_64 JIT failures.

llvm-svn: 70986

For implicit decls like "self" and "_cmd" in ObjC, these decls
should not have a location.

llvm-svn: 70964

llvm-svn: 70953

llvm-svn: 70950

llvm-svn: 70937

- Synchronize instruction length computation code in X86InstrInfo with code in X86CodeEmitter.cpp
Patch by Zoltan Varga.

llvm-svn: 70929

CallbackVH, with fixes. allUsesReplacedWith need to
walk the def-use chains and invalidate all users of a
value that is replaced. SCEVs of users need to be
recalcualted even if the new value is equivalent. Also,
make forgetLoopPHIs walk def-use chains, since any
SCEV that depends on a PHI should be recalculated when
more information about that PHI becomes available.

llvm-svn: 70927

llvm-svn: 70925

llvm-svn: 70924

shows up in -print-machineinstrs.  This doesn't appear to affect anything, but it was
weird for some DBG_LABELs to have DebugLocs but not all of them.

llvm-svn: 70921

llvm-svn: 70919

llvm-svn: 70902

llvm-svn: 70900

Patch by Collin Winter!

llvm-svn: 70898

in a comment.

llvm-svn: 70882

llvm-svn: 70880

only capture their arguments by returning them or
throwing an exception or not based on the argument
value.  Patch essentially by Frits van Bommel.

llvm-svn: 70876

llvm-svn: 70872

-Depend on DebugLocs for source line info.

(Comes with Regression-Be-Gone(tm))

llvm-svn: 70871

llvm-svn: 70821

  ThreadEdge directly.  This shares the code, but is just a refactoring.
* Make JumpThreading compute the set of loop headers and avoid threading
  across them.  This prevents jump threading from forming irreducible 
  loops (goodness) but also prevents it from threading in other cases that
  are beneficial (see the comment above FindFunctionBackedges).

llvm-svn: 70820

FindFunctionBackedges function.

llvm-svn: 70819

The stack slots which share the same stack slot after coloring can, but do not have to, use the same register. In fact, they each may have different register class requirements.

llvm-svn: 70815

llvm-svn: 70811

-Depend on DebugLocs for source line info.

llvm-svn: 70803

llvm-svn: 70792

In some rare cases, the register allocator can spill registers but end up not utilizing registers at all. The fundamental problem is linearscan's backtracking can end up freeing more than one allocated registers. However,  reloads and restores might be folded into uses / defs and freed registers might not be used at all.

VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants.

Not yet enabled. This is part 1. More coming.

llvm-svn: 70787

Thanks for Dan Gohman for suggestion!

llvm-svn: 70782

llvm-svn: 70770

llvm-svn: 70769

llvm-svn: 70768